Scholarlink

<p>The cement plants in the industrial clusters located across Kalaburagi district, Karnataka, India emit approximately 3.8 million tons of CO<sub>2</sub> per annum and simultaneously produce several thousand cubic meters of alkaline wastewater (pH 10.5–12.8; Ca<sup>2</sup>⁺ 450–950&#xa0;mg/L) from the co-located electroplating and textile industries.&#xa0;This study demonstrates the design, soft computing optimization and pilot-scale validation over 90&#xa0;days of an integrated system involving ZIF-8/Matrimid MMMs for post-combustion CO<sub>2</sub> capture and treatment of alkaline industrial wastewater through in-situ carbon mineralization.&#xa0;To evaluate the performance metrics of maximum CO<sub>2</sub> capture efficiency and minimum specific energy consumption while maximizing economic profit obtained from sale of PCC by-product, multi-objective optimization of the integrated system was performed using a soft computing workflow involving ANN, ANFIS and NSGA-II-based PSO models. ZIF-8/Matrimid MMM with 30&#xa0;wt% ZIF-8 loading displayed an experimentally measured CO<sub>2</sub> permeability of 42.3 Barrer and CO<sub>2</sub>/N<sub>2</sub> selectivity of 28.4 which is a 386% increase over that of neat Matrimid. Experimental validation of PSO-suggested operating conditions yielded a CO<sub>2</sub> capture efficiency of 86.2% at transmembrane pressure of 3.2&#xa0;bar and temperature of 32&#xa0;°C with ZIF-8 loading of 28&#xa0;wt% while treating 2.4&#xa0;m<sup>3</sup>/h alkaline wastewater to produce 42.1&#xa0;kg/h PCC with 93.8% calcite content which is fit-for-use as cement clinker replacement in a 90-day pilot study conducted at ACC Cement Plant, Kalaburagi. As the wastewater treated using this technology is recycled back to the plant after near-zero liquid discharge (&gt; 98% wastewater recovery), the overall carbon intensity was lowered by 68% per tonne of clinker produced. The technology achieved a payback period of 5.4&#xa0;months and an NPV of ₹4,312 million over 15&#xa0;years from the sale of PCC by-product.&#xa0;The global warming potential was 74% lower than the no CO<sub>2</sub> capture baseline case from life cycle assessment of the technology.&#xa0;To the best of our knowledge, this work showcases the first pilot-scale demonstration of a soft computing-optimized MOF membrane integrated with carbon mineralization for the Indian cement industry.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Soft computing framework-optimized ZIF-8 mixed matrix membrane for integrated CO2 capture and industrial wastewater mineralization

  • 期刊论文

  • 发表日期：

    2026年7月7日

查看全文
  • K. Rashmi,
  • D. Sreenivasulu,
  • M. Nagaraj,
  • H. T. Avinash

摘要

The cement plants in the industrial clusters located across Kalaburagi district, Karnataka, India emit approximately 3.8 million tons of CO2 per annum and simultaneously produce several thousand cubic meters of alkaline wastewater (pH 10.5–12.8; Ca2⁺ 450–950 mg/L) from the co-located electroplating and textile industries. This study demonstrates the design, soft computing optimization and pilot-scale validation over 90 days of an integrated system involving ZIF-8/Matrimid MMMs for post-combustion CO2 capture and treatment of alkaline industrial wastewater through in-situ carbon mineralization. To evaluate the performance metrics of maximum CO2 capture efficiency and minimum specific energy consumption while maximizing economic profit obtained from sale of PCC by-product, multi-objective optimization of the integrated system was performed using a soft computing workflow involving ANN, ANFIS and NSGA-II-based PSO models. ZIF-8/Matrimid MMM with 30 wt% ZIF-8 loading displayed an experimentally measured CO2 permeability of 42.3 Barrer and CO2/N2 selectivity of 28.4 which is a 386% increase over that of neat Matrimid. Experimental validation of PSO-suggested operating conditions yielded a CO2 capture efficiency of 86.2% at transmembrane pressure of 3.2 bar and temperature of 32 °C with ZIF-8 loading of 28 wt% while treating 2.4 m3/h alkaline wastewater to produce 42.1 kg/h PCC with 93.8% calcite content which is fit-for-use as cement clinker replacement in a 90-day pilot study conducted at ACC Cement Plant, Kalaburagi. As the wastewater treated using this technology is recycled back to the plant after near-zero liquid discharge (> 98% wastewater recovery), the overall carbon intensity was lowered by 68% per tonne of clinker produced. The technology achieved a payback period of 5.4 months and an NPV of ₹4,312 million over 15 years from the sale of PCC by-product. The global warming potential was 74% lower than the no CO2 capture baseline case from life cycle assessment of the technology. To the best of our knowledge, this work showcases the first pilot-scale demonstration of a soft computing-optimized MOF membrane integrated with carbon mineralization for the Indian cement industry.

Graphical Abstract